Machine hours and electricity costs for AMK Industries for the past year were as follows: Month Machine Hours Electricity Costs $18,900 21,500 14,000 January February March April May June July August September October November December Required: 2,000 2,400 1,400 2,600 3,300 3,300 3,600 3,000 1,500 3,300 4,200 4,200 23,500 28,750 22,700 25,250 23,250 16,000 26,500 31,500 22,250 Estimate electricity costs for a month in which 1,300 machine hours are worked.